
Ald-CH2-PEG5-azide is a crosslinker containing an azide group and an aldehyde group. The azide group enables PEGylation via Click Chemistry. The aldehyde group reacts with amines and the N-terminal of peptides and proteins to form an imine containing a C=N double bond, which can be further reduced. PEG aldehyde or ketone derivatives can be used in reversible PEGylation through its reaction with hydrazine or hydrazide forming a hydrolytic acyl hydrozone linkage.
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